Infineon Technologies TLE4276GV50ATMA4

Overview

TLE4276GV50ATMA4 from Infineon is a fixed-output 5.0 V low-dropout linear voltage regulator in PG-TO263-5 package, delivering up to 400 mA output current with ±4% output voltage tolerance, 250–500 mV dropout at 250 mA, and inhibit-controlled shutdown (<10 µA quiescent current). It is AEC-Q100 qualified for automotive power supply rails feeding microcontrollers, sensors, and CAN transceivers.

For engineers reviewing the TLE4276GV50ATMA4 datasheet, TLE4276GV50ATMA4 pinout, TLE4276GV50ATMA4 application, or TLE4276GV50ATMA4 equivalent, key selection criteria include dropout voltage at high load, thermal resistance (R_thj-c = 4 K/W), reverse-polarity protection, short-circuit robustness, and AEC-Q100 qualification for under-hood environments.

Technical Context

The TLE4276GV50ATMA4 implements a bandgap-referenced control amplifier driving a series pass transistor with saturation control to prevent oversaturation under heavy load. Its internal protection circuits provide reverse-polarity immunity, overtemperature shutdown (T_j > 150 °C), and short-circuit current limiting (400–1100 mA).

It operates across input voltages from (V_Q + 0.5) V to 40 V, supports stable regulation with ≥22 µF/≤3 Ω ESR output capacitance, and achieves 54 dB PSRR at 100 Hz. The inhibit input is active-low and enables system-level power sequencing.

Key Specifications

Pinout & Package

Package: PG-TO263-5 (D²PAK), thermally enhanced surface-mount package with exposed metal tab connected to GND for heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output automotive LDO regulator applications.

Compared with TLV73350PDBVR and TPS7B6950QDCYRQ1, the TLE4276GV50ATMA4 uniquely combines 400 mA output, reverse-polarity immunity, AEC-Q100 Grade 0 qualification, and 4 K/W thermal resistance-making it the only option among the three viable for high-temperature, high-current, fault-resilient automotive power rails.

Availability

TLE4276GV50ATMA4 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering systems requiring stable component supply, long-term automotive lifecycle support, and RoHS-compliant green manufacturing.

Supply support for TLE4276GV50ATMA4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global R&D and wafer fabrication infrastructure.

The OPTIREG™ linear product line delivers robust, AEC-Q100-qualified voltage regulators optimized for harsh automotive environments-including start-stop, cold-crank, and reverse-battery conditions-targeting ECU, sensor, and actuator power domains.

FAQ

What is the minimum input voltage required for regulation at full 400 mA load?

The TLE4276GV50ATMA4 requires input voltage ≥ (V_Q + 0.5) V = 5.5 V for regulation. At 400 mA, typical dropout is ≤500 mV, so 5.5 V input sustains 5.0 V output. For margin under worst-case tolerance and temperature, 6.0 V is recommended. Input below 5.5 V causes dropout and unregulated output.

Can the INH pin be left floating in the circuit?

No. The INH pin must be actively driven high (≥2.0 V) for normal operation or pulled low (≤0.8 V) to enter ultra-low-power shutdown. Leaving it floating risks undefined behavior due to internal pull-down weakness and susceptibility to noise-induced toggling, potentially causing intermittent output disable.

Is an external heatsink required for 400 mA continuous operation?

Not necessarily. With R_thj-c = 4 K/W and typical P_D ≈ 0.2 W at 13.5 V input, junction temperature rise above case is ~0.8 °C. Full thermal design depends on PCB copper area and airflow, but the exposed GND tab enables effective conduction cooling without added heatsinks in most automotive PCB layouts.

Does the TLE4276GV50ATMA4 support adjustable output voltage?

No. The 'V50' suffix denotes the fixed 5.0 V output version. Adjustable variants (e.g., TLE4276GV) use Pin 4 (VA) for external resistor feedback, but TLE4276GV50ATMA4 has Pin 4 marked N.C. and internally configured for 5.0 V. Attempting to connect VA will not alter output and may impair regulation.